' : print "";
}

/**
 * Add's an entry to the changelog
 *
 * @author Andreas Gohr 
 */
function addLogEntry($date,$id,$summary='',$minor=false){
  global $conf;

  if(!@is_writable($conf['changelog'])){
    msg($conf['changelog'].' is not writable!',-1);
    return;
  }

  if(!$date) $date = time(); //use current time if none supplied
  $remote = $_SERVER['REMOTE_ADDR'];
  $user   = $_SERVER['REMOTE_USER'];

  if($conf['useacl'] && $user && $minor){
    $summary = '*'.$summary;
  }else{
    $summary = ' '.$summary;
  }

  $logline = join("\t",array($date,$remote,$id,$user,$summary))."\n";
  io_saveFile($conf['changelog'],$logline,true);
}

/**
 * Checks an summary entry if it was a minor edit
 *
 * The summary is cleaned of the marker char
 *
 * @author Andreas Gohr 
 */
function isMinor(&$summary){
  if(substr($summary,0,1) == '*'){
    $summary = substr($summary,1);
    return true;
  }
  $summary = trim($summary);
  return false;
}

/**
 * Internal function used by getRecents
 *
 * don't call directly
 *
 * @see getRecents()
 * @author Andreas Gohr 
 */
function _handleRecent($line,$ns,$flags){
  static $seen  = array();         //caches seen pages and skip them
  if(empty($line)) return false;   //skip empty lines

  // split the line into parts
  list($dt,$ip,$id,$usr,$sum) = explode("\t",$line);

  // skip seen ones
  if($seen[$id]) return false;
  $recent = array();

  // check minors
  if(isMinor($sum)){
    // skip minors
    if($flags & RECENTS_SKIP_MINORS) return false;
    $recent['minor'] = true;
  }else{
    $recent['minor'] = false;
  }

  // remember in seen to skip additional sights
  $seen[$id] = 1;

  // check if it's a hidden page
  if(isHiddenPage($id)) return false;

  // filter namespace
  if (($ns) && (strpos($id,$ns.':') !== 0)) return false;

  // exclude subnamespaces
  if (($flags & RECENTS_SKIP_SUBSPACES) && (getNS($id) != $ns)) return false;

  // check ACL
  if (auth_quickaclcheck($id) < AUTH_READ) return false;

  // check existance
  if(!@file_exists(wikiFN($id))){
    if($flags & RECENTS_SKIP_DELETED){
      return false;
    }else{
      $recent['del'] = true;
    }
  }else{
    $recent['del'] = false;
  }

  $recent['id']   = $id;
  $recent['date'] = $dt;
  $recent['ip']   = $ip;
  $recent['user'] = $usr;
  $recent['sum']  = $sum;

  return $recent;
}


/**
 * returns an array of recently changed files using the
 * changelog
 *
 * The following constants can be used to control which changes are
 * included. Add them together as needed.
 *
 * RECENTS_SKIP_DELETED   - don't include deleted pages
 * RECENTS_SKIP_MINORS    - don't include minor changes
 * RECENTS_SKIP_SUBSPACES - don't include subspaces
 *
 * @param int    $first   number of first entry returned (for paginating
 * @param int    $num     return $num entries
 * @param string $ns      restrict to given namespace
 * @param bool   $flags   see above
 *
 * @author Andreas Gohr 
 */
function getRecents($first,$num,$ns='',$flags=0){
  global $conf;
  $recent = array();
  $count  = 0;

  if(!$num)
    return $recent;

  if(!@is_readable($conf['changelog'])){
    msg($conf['changelog'].' is not readable',-1);
    return $recent;
  }

  $fh  = fopen($conf['changelog'],'r');
  $buf = '';
  $csz = 4096;                              //chunksize
  fseek($fh,0,SEEK_END);                    // jump to the end
  $pos = ftell($fh);                        // position pointer

  // now read backwards into buffer
  while($pos > 0){
    $pos -= $csz;                           // seek to previous chunk...
    if($pos < 0) {                          // ...or rest of file
      $csz += $pos;
      $pos = 0;
    }

    fseek($fh,$pos);

    $buf = fread($fh,$csz).$buf;            // prepend to buffer

    $lines = explode("\n",$buf);            // split buffer into lines

    if($pos > 0){
      $buf = array_shift($lines);           // first one may be still incomplete
    }

    $cnt = count($lines);
    if(!$cnt) continue;                     // no lines yet

    // handle lines
    for($i = $cnt-1; $i >= 0; $i--){
      $rec = _handleRecent($lines[$i],$ns,$flags);
      if($rec !== false){
        if(--$first >= 0) continue;         // skip first entries
        $recent[] = $rec;
        $count++;

        // break while when we have enough entries
        if($count >= $num){
          $pos = 0; // will break the while loop
          break;    // will break the for loop
        }
      }
    }
  }// end of while

  fclose($fh);
  return $recent;
}

/**
 * gets additonal informations for a certain pagerevison
 * from the changelog
 *
 * @author Andreas Gohr 
 */
function getRevisionInfo($id,$rev){
  global $conf;

  if(!$rev) return(null);

  $info = array();
  if(!@is_readable($conf['changelog'])){
    msg($conf['changelog'].' is not readable',-1);
    return $recent;
  }
  $loglines = file($conf['changelog']);
  $loglines = preg_grep("/$rev\t\d+\.\d+\.\d+\.\d+\t$id\t/",$loglines);
  $loglines = array_reverse($loglines); //reverse sort on timestamp (shouldn't be needed)
  $line = split("\t",$loglines[0]);
  $info['date']  = $line[0];
  $info['ip']    = $line[1];
  $info['user']  = $line[3];
  $info['sum']   = $line[4];
  $info['minor'] = isMinor($info['sum']);
  return $info;
}

/**
 * Saves a wikitext by calling io_saveFile
 *
 * @author Andreas Gohr 
 */
function saveWikiText($id,$text,$summary,$minor=false){
  global $conf;
  global $lang;
  // ignore if no changes were made
  if($text == rawWiki($id,'')){
    return;
  }

  $file = wikiFN($id);
  $old  = saveOldRevision($id);

  if (empty($text)){
    // remove empty file
    @unlink($file);
    // remove any meta info
    $mfiles = metaFiles($id);
    foreach ($mfiles as $mfile) {
      if (file_exists($mfile)) @unlink($mfile);
    }
    $del = true;
    // autoset summary on deletion
    if(empty($summary)) $summary = $lang['deleted'];
    // unlock early
    unlock($id);
    // remove empty namespaces
    io_sweepNS($id);
  }else{
    // save file (datadir is created in io_saveFile)
    io_saveFile($file,$text);
    $del = false;
  }

  addLogEntry(@filemtime($file),$id,$summary,$minor);
  // send notify mails
  notify($id,'admin',$old,$summary,$minor);
  notify($id,'subscribers',$old,$summary,$minor);

  //purge cache on add by updating the purgefile
  if($conf['purgeonadd'] && (!$old || $del)){
    io_saveFile($conf['cachedir'].'/purgefile',time());
  }
}

/**
 * moves the current version to the attic and returns its
 * revision date
 *
 * @author Andreas Gohr 
 */
function saveOldRevision($id){
  global $conf;
  $oldf = wikiFN($id);
  if(!@file_exists($oldf)) return '';
  $date = filemtime($oldf);
  $newf = wikiFN($id,$date);
  if(substr($newf,-3)=='.gz'){
    io_saveFile($newf,rawWiki($id));
  }else{
    io_makeFileDir($newf);
    copy($oldf, $newf);
  }
  return $date;
}

/**
 * Sends a notify mail on page change
 *
 * @param  string  $id       The changed page
 * @param  string  $who      Who to notify (admin|subscribers)
 * @param  int     $rev      Old page revision
 * @param  string  $summary  What changed
 * @param  boolean $minor    Is this a minor edit?
 *
 * @author Andreas Gohr 
 */
function notify($id,$who,$rev='',$summary='',$minor=false){
  global $lang;
  global $conf;

  // decide if there is something to do
  if($who == 'admin'){
    if(empty($conf['notify'])) return; //notify enabled?
    $text = rawLocale('mailtext');
    $to   = $conf['notify'];
    $bcc  = '';
  }elseif($who == 'subscribers'){
    if(!$conf['subscribers']) return; //subscribers enabled?
    if($conf['useacl'] && $_SERVER['REMOTE_USER'] && $minor) return; //skip minors
    $bcc  = subscriber_addresslist($id);
    if(empty($bcc)) return;
    $to   = '';
    $text = rawLocale('subscribermail');
  }else{
    return; //just to be safe
  }

  $text = str_replace('@DATE@',date($conf['dformat']),$text);
  $text = str_replace('@BROWSER@',$_SERVER['HTTP_USER_AGENT'],$text);
  $text = str_replace('@IPADDRESS@',$_SERVER['REMOTE_ADDR'],$text);
  $text = str_replace('@HOSTNAME@',gethostbyaddr($_SERVER['REMOTE_ADDR']),$text);
  $text = str_replace('@NEWPAGE@',wl($id,'',true),$text);
  $text = str_replace('@PAGE@',$id,$text);
  $text = str_replace('@TITLE@',$conf['title'],$text);
  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
  $text = str_replace('@SUMMARY@',$summary,$text);
  $text = str_replace('@USER@',$_SERVER['REMOTE_USER'],$text);

  if($rev){
    $subject = $lang['mail_changed'].' '.$id;
    $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",true),$text);
    require_once(DOKU_INC.'inc/DifferenceEngine.php');
    $df  = new Diff(split("\n",rawWiki($id,$rev)),
                    split("\n",rawWiki($id)));
    $dformat = new UnifiedDiffFormatter();
    $diff    = $dformat->format($df);
  }else{
    $subject=$lang['mail_newpage'].' '.$id;
    $text = str_replace('@OLDPAGE@','none',$text);
    $diff = rawWiki($id);
  }
  $text = str_replace('@DIFF@',$diff,$text);
  $subject = '['.$conf['title'].'] '.$subject;

  mail_send($to,$subject,$text,$conf['mailfrom'],'',$bcc);
}

/**
 * Return a list of available page revisons
 *
 * @author Andreas Gohr 
 */
function getRevisions($id){
  $revd = dirname(wikiFN($id,'foo'));
  $revs = array();
  $clid = cleanID($id);
  if(strrpos($clid,':')) $clid = substr($clid,strrpos($clid,':')+1); //remove path
  $clid = utf8_encodeFN($clid);

  if (is_dir($revd) && $dh = opendir($revd)) {
    while (($file = readdir($dh)) !== false) {
      if (is_dir($revd.'/'.$file)) continue;
      if (preg_match('/^'.$clid.'\.(\d+)\.txt(\.gz)?$/',$file,$match)){
        $revs[]=$match[1];
      }
    }
    closedir($dh);
  }
  rsort($revs);
  return $revs;
}

/**
 * extracts the query from a google referer
 *
 * @todo   should be more generic and support yahoo et al
 * @author Andreas Gohr 
 */
function getGoogleQuery(){
  $url = parse_url($_SERVER['HTTP_REFERER']);
  if(!$url) return '';

  if(!preg_match("#google\.#i",$url['host'])) return '';
  $query = array();
  parse_str($url['query'],$query);

  return $query['q'];
}

/**
 * Try to set correct locale
 *
 * @deprecated No longer used
 * @author     Andreas Gohr 
 */
function setCorrectLocale(){
  global $conf;
  global $lang;

  $enc = strtoupper($lang['encoding']);
  foreach ($lang['locales'] as $loc){
    //try locale
    if(@setlocale(LC_ALL,$loc)) return;
    //try loceale with encoding
    if(@setlocale(LC_ALL,"$loc.$enc")) return;
  }
  //still here? try to set from environment
  @setlocale(LC_ALL,"");
}

/**
 * Return the human readable size of a file
 *
 * @param       int    $size   A file size
 * @param       int    $dec    A number of decimal places
 * @author      Martin Benjamin 
 * @author      Aidan Lister 
 * @version     1.0.0
 */
function filesize_h($size, $dec = 1){
  $sizes = array('B', 'KB', 'MB', 'GB');
  $count = count($sizes);
  $i = 0;

  while ($size >= 1024 && ($i < $count - 1)) {
    $size /= 1024;
    $i++;
  }

  return round($size, $dec) . ' ' . $sizes[$i];
}

/**
 * return an obfuscated email address in line with $conf['mailguard'] setting
 *
 * @author Harry Fuecks 
 * @author Christopher Smith 
 */
function obfuscate($email) {
  global $conf;

  switch ($conf['mailguard']) {
    case 'visible' :
      $obfuscate = array('@' => ' [at] ', '.' => ' [dot] ', '-' => ' [dash] ');
      return strtr($email, $obfuscate);

    case 'hex' :
      $encode = '';
      for ($x=0; $x < strlen($email); $x++) $encode .= '&#x' . bin2hex($email{$x}).';';
      return $encode;

    case 'none' :
    default :
      return $email;
  }
}

/**
 * Return DokuWikis version
 *
 * @author Andreas Gohr 
 */
function getVersion(){
  //import version string
  if(@file_exists('VERSION')){
    //official release
    return 'Release '.trim(io_readfile(DOKU_INC.'/VERSION'));
  }elseif(is_dir('_darcs')){
    //darcs checkout
    $inv = file('_darcs/inventory');
    $inv = preg_grep('#\*\*\d{14}[\]$]#',$inv);
    $cur = array_pop($inv);
    preg_match('#\*\*(\d{4})(\d{2})(\d{2})#',$cur,$matches);
    return 'Darcs '.$matches[1].'-'.$matches[2].'-'.$matches[3];
  }else{
    return 'snapshot?';
  }
}

/**
 * Run a few sanity checks
 *
 * @author Andreas Gohr 
 */
function check(){
  global $conf;
  global $INFO;

  msg('DokuWiki version: '.getVersion(),1);

  if(version_compare(phpversion(),'4.3.0','<')){
    msg('Your PHP version is too old ('.phpversion().' vs. 4.3.+ recommended)',-1);
  }elseif(version_compare(phpversion(),'4.3.10','<')){
    msg('Consider upgrading PHP to 4.3.10 or higher for security reasons (your version: '.phpversion().')',0);
  }else{
    msg('PHP version '.phpversion(),1);
  }

  if(is_writable($conf['changelog'])){
    msg('Changelog is writable',1);
  }else{
    msg('Changelog is not writable',-1);
  }

  if(is_writable($conf['datadir'])){
    msg('Datadir is writable',1);
  }else{
    msg('Datadir is not writable',-1);
  }

  if(is_writable($conf['olddir'])){
    msg('Attic is writable',1);
  }else{
    msg('Attic is not writable',-1);
  }

  if(is_writable($conf['mediadir'])){
    msg('Mediadir is writable',1);
  }else{
    msg('Mediadir is not writable',-1);
  }

  if(is_writable($conf['cachedir'])){
    msg('Cachedir is writable',1);
  }else{
    msg('Cachedir is not writable',-1);
  }

  if(is_writable(DOKU_CONF.'users.auth.php')){
    msg('conf/users.auth.php is writable',1);
  }else{
    msg('conf/users.auth.php is not writable',0);
  }

  if(function_exists('mb_strpos')){
    if(defined('UTF8_NOMBSTRING')){
      msg('mb_string extension is available but will not be used',0);
    }else{
      msg('mb_string extension is available and will be used',1);
    }
  }else{
    msg('mb_string extension not available - PHP only replacements will be used',0);
  }

  if($conf['allowdebug']){
    msg('Debugging support is enabled. If you don\'t need it you should set $conf[\'allowdebug\'] = 0',-1);
  }else{
    msg('Debugging support is disabled',1);
  }

  msg('Your current permission for this page is '.$INFO['perm'],0);

  if(is_writable($INFO['filepath'])){
    msg('The current page is writable by the webserver',0);
  }else{
    msg('The current page is not writable by the webserver',0);
  }

  if($INFO['writable']){
    msg('The current page is writable by you',0);
  }else{
    msg('The current page is not writable you',0);
  }
}

/**
 * Let us know if a user is tracking a page
 *
 * @author Andreas Gohr 
 */
function is_subscribed($id,$uid){
  $file=metaFN($id,'.mlist');
  if (@file_exists($file)) {
    $mlist = file($file);
    $pos = array_search($uid."\n",$mlist);
    return is_int($pos);
  }

  return false;
}

/**
 * Return a string with the email addresses of all the
 * users subscribed to a page
 *
 * @author Steven Danz 
 */
function subscriber_addresslist($id){
  global $conf;
  global $auth;

  $emails = '';

  if (!$conf['subscribers']) return;

  $mlist = array();
  $file=metaFN($id,'.mlist');
  if (file_exists($file)) {
    $mlist = file($file);
  }
  if(count($mlist) > 0) {
    foreach ($mlist as $who) {
      $who = rtrim($who);
      $info = $auth->getUserData($who);
      $level = auth_aclcheck($id,$who,$info['grps']);
      if ($level >= AUTH_READ) {
        if (strcasecmp($info['mail'],$conf['notify']) != 0) {
          if (empty($emails)) {
            $emails = $info['mail'];
          } else {
            $emails = "$emails,".$info['mail'];
          }
        }
      }
    }
  }

  return $emails;
}

/**
 * Removes quoting backslashes
 *
 * @author Andreas Gohr 
 */
function unslash($string,$char="'"){
  return str_replace('\\'.$char,$char,$string);
}

//Setup VIM: ex: et ts=2 enc=utf-8 :